package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;

import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {

        //校验手机号
        if (RegexUtils.isPhoneInvalid(phone)){
            //不符合返回错误信息
            return Result.fail("手机号格式错误");
        }
        //符合 生成验证码
        String code = RandomUtil.randomNumbers(6);
        //保存验证码到 redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //发送验证码
        System.out.println("发送验证码成功");
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {

        //校验手机号码
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)){
        // 2.如果不符合，返回错误信息
            return Result.fail("手机号格式错误！");
        }
        //从redis中获取验证码与用户输入的验证码进行匹配
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.equals(code)) {
            // 不一致，报错
            return Result.fail("验证码错误");
        }
        // 4.一致，根据手机号查询用户 select * from tb_user where phone = ?
        User user = query().eq("phone", phone).one();

        //用户信息为空 创建一个新用户
        if (user == null){
            // 6.不存在，创建新用户并保存
            user = createUserWithPhone(phone);
        }
        // 7.保存用户信息到 redis中
        // 7.1.随机生成token，作为登录令牌
        String token = UUID.randomUUID().toString();
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);

        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO);

        String tokenKey = LOGIN_USER_KEY + token;

        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);

        //设置过期时间
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL, TimeUnit.MINUTES);
        //后续所有操作都要携带token进行校验

        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        // 1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        // 2.保存用户
        save(user);
        return user;
    }
}
